| 摘要 |
A webbing lock device for a webbing retractor in which a takeup shaft is locked and prevented from rotating in a webbing drawing-out direction when the takeup shaft has rotated by a predetermined amount in the webbing drawing-out direction after meshing engagement between a lock wheel and a pawl lever. The webbing lock device is provided with a ratchet wheel which is disposed coaxially with the takeup shaft and has around an outer peripheral portion thereof external ratchet teeth capable of meshing with the pawl lever. The ratchet wheel is adapted to receive a rotating force of the takeup shaft in the webbing drawing-out direction via a frictional force when the takeup shaft rotates in the webbing drawing-out direction, while the ratchet wheel is rotated integrally with the takeup shaft by engaging with the takeup shaft when the takeup shaft rotates in a webbing taking-up direction. The pawl lever is spaced apart from the lock wheel by the external ratchet tooth when an amount of rotation of the takeup shaft in the webbing taking-up direction with the lock wheel meshing with the pawl lever is less than the predetermined amount. As a result, since the pawl lever is forcedly spaced apart from the lock wheel by the ratchet wheel when the takeup shaft rotates in the webbing taking-up direction, an increase in the tension of the webbing is prevented when the vehicle is run on a rough road.
|
